Double-acting deep-well pump



Apr. 3, 1923.

R. C. LEGO' DOUBLE ACTING DEEP WELL PUM 2 shams-,sheet l Filed May l5, 1922 y gyn/vanto@ HueZZ C. ego

Apr. 3, 1923.

R. c. LEGO DOUBLE ACTING DEEP WELL PUMP :El I

L O l 54g 4 Hi ,l 21

L ...L y V UF v 3 l l 38 3 Filed May l5, 1922 2 sheets-sheet 2 31a/vento@ Patented Apr. 3, 1923.

UNET ST RUSSELL C..LEGO, OF BEAVER FALLS, PENNSYLVANIA.

DOUBLE-ACTING DEEP-WELL PUMP.

Application' iled May 15,

To aU Lo/tom t may concern.'

Be it known that I, RUSSELL C. LEGO, a citizen of the United States, residing at Beaver Falls, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Double- Acting Deep-IVell Pumps, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to pumps, and particularly to double acting pumps, these pumps having two pistons operating within one barrel and operating in reverse directions.

The general object of my invention is to provide a very simple and effective mecha-- nism whereby the two pisto-ns may be shifted coincidently in opposite directions.

A further object is to provide a very simple mechanism .for shifting the.' pistons which may be readily connected to the motor, and provide means whereby the piston rods, sucker rods, or plunger rods of the pump may be readilyconnectcd to or disconnected from the operating mechanism.

vStill another object is to provide means whereby the plunger or sucker rods ofthe pump may be disconnected from the operating mechanism and connected to a cable passing over a sheave whereby the pump rods may be pulled.

Other objects have to do with the details of construction and arrangement of parts as will appear more fully hereinafter.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation of a pumping mechanism embodying my invention, the partsbeing broken away and shown in section" F fgure 2 is a front elevation of the construction shown in Figure l;

Figure 3 is a section on the line 3 3 of Figure 2;

Referring to these drawings, designates the base of the pump operating mechanism, 1l the barrel of the pump, 12 the T or elbow disposed at the top of the barrel and beneath the base l0, and 13the outlet from the pump barrel. At the upper end of the barrel 11 and carried by the base 10 lis a packing gland 111 through which a tubular piston rod or sucker rod 15 passes.

Operating within the. tubular piston or' sucker rod 15 is av centrally disposed, preferably solid, .piston or sucker rod 16. Both 1922. Serial No. 560,980.

o f these rods are screw-threaded at their upper ends for attachment to operating mechanism, as will be later stated. The central rod 16 carries upon it the piston 17, which 1s of any ordinary or suitable construction, and which is properlv packed in the'usual manner and whichr is provided with the upwardly opening valve 1S, as usual. Mounted upon the tubular -rod 15 is the piston 19, which is also constructed in the usual manner and has an upwardly opening valve 20. These rods are operated in opposite directions. In other words, as the central rod 16 moves downward, the outer rod 15 moves upward, and vice versa.

The means whereby this result is secured is as follows: Mounted upon the base 10 and extending upwardly therefrom are the standards or housing membersV 21. These are disposed opposite to leach other and each of these standards is laterally extended just above the base, as at22,'so as to.v form side walls upon which a motor 23 is mounted, the shaft of the motor beine designated. 24C. Mounted within the side pIates 22 is. a shaftv 25 vupon which is carried a gear wheel 26 ing out therefrom. The motor carries a pinion 23a meshing with a gear wheel 28 which meshes with the,y gear wheel 26, and connected to the wrist pin 27a is the connecting rod 27 which is pivoted to the end; of a crank arm 29 mounted upon a shaft. 30 which extends through the side plates 2l of the housing and is mounted in suitable bearings thereon. This crank arm 29 is on the eX- terior of the housing and is preferably a double crank` arm, between which the upper end of' the connecting: rod is pivotally mounted upon the wrist pin 31. Disposed between the side plates and ori the shaft 30 is a gear wheel 32 which is longitudinally shiftable along the shaft but may be held in place in any suitable manner, as for instance by the set screw 33. I do not wish fto be limited to the particular gearing shown, nor to any particular manner of holding the gear wheel 32 in place.-

Attached by bolts to the side plates 21 and extending down on eac-hv edge thereof and bridging the space between the side plates having a crank pin or wrist pin a projectare the end plates311 which. constitute part of the housing. These, as-illustrated in Figure 3, are recessed at 35 to receive the side walls 21 and the middle, of each plate is outwardly bowed and recessed, as at 36, and

this recess in turn is counter-recessed, as at 37. Operating in the counter-recess is a rack bar 38 T-shaped in cross section, and disposed in the recess 36 are the guide strips 39 held in place by screws 40 and extending over the base of the rack bar so that thus the rack bars 38 are guided for longitudinal movement on the plates 34 and held from any lateral play. There are two of these rack bars 38 and 38a and each rack bar is provided on its inner face with teeth meshing with the gear wheel 32. The rack bar 38 is angularly bent at its lower end, as at 41, and is apertured for the passage of the upper end of the solid piston rod 16. Preferably this aperture is screw-threaded. Jain nuts 42 engage the piston rod 16 above and below the angular portion 41. The opposite.

rack 381 is also angularly bent, as at 43, and apertured for the passage of the hollow piston rod 15,. This piston rod is held in place in this angular portion 43 by the nuts 44. It will thus be seen that as the gear wheel 26 rotates an oscillatory movement will be communicated to the shaft 30 and to the gear wheel 32, and as a consequence the rack bars 38 and 38a will be reciprocated iny opposite directions and the piston rods will be also reciprocated in opposite directions. As one piston rod moves down, the other piston rod moves up, and as one piston moves down its valve opens to the inlet of water, while the other valve closes and lifts the water. Of course, in order to prevent any outlet of water through the upper end of the tubular piston rod 15 and around the solid rod 16, I provide a packing gland 45 which is attached to and forms part of the upper end of the piston'rod 15.

The operation of the mechanism so far will be obvious to those skilled in the art. It will be obvious that the shaft 25 mightbe operatively connected to any suitable motor, though I have illustrated an electric motor, and that this shaft 25 might be operated for relatively shallow wells by hand, though my mechanism is primarily intended for deep wells, and under theseV circumstances the pumping mechanism will be driven by the motor.

In deep wells it becomes necessary every now and then to draw or p'ull7 the piston or sticker rods, and in order to provide means whereby this may be done without removing the pump or changing its position, I mount permanentlyupon the shaft 3() the laterally shiftable sheave 46 and on the shaft 25 the winch 47. In order to pull the sticker rods all that is necessary is to remove the rack bars 38 and 38a after disconnecting them from the pump rods, slide gear 32 over to one side and slide the sheave 46 over to center, then the connecting rod 27 is disconnected and all is ready. The cable is placed over an ordinary gin pole pulley, thence passes to sheave 46, then around the winch 47. Thus, by starting the motor the rods and valves can be pulled up through the center of the machine, it being understood, ofcourse, that the working barrel in which the valves operate is at least 2,- smaller than the well casing so as to remove the rods and valves without injury to either.

It is obvious that with this construction the pump rods move absolutely vertically without any side strain or flexing, and that power is very positively communicated to the pump rods. The connecting rod 27 may be made with a plurality of openings for the wrist pin 27L so as to adjustthe stroke of the pump rods, the racks 38 and 38a being, of course, of suficient size to permit this adjustment. This construction provides for a very even and regular stroke of the pumping rods and for a steady flow of water from the pump and also, as before described, provides for the ready pulling of the well.

IVhile I have illustrated a construction which I believe to be particularly effective for the purpose intended, I do not wish to be limited thereto, as it is obvious that many changes might be made in the details of this construction without departing from the spirit of the invention as defined in the appended claims.

I claim 1. In a pump, a barrel, a pair of pistons operating therein, a tubular piston rod connected to one of said pistons, a solid piston rod passing through the tubular piston rod and connected to the other piston, a packing gland at the upper end of the tubular piston rod, a supporting structure including oppositely disposed, vertical guides, oppositely disposed, vertically reciprocating rack bars mounted in said guides and T- shaped in cross section, each of said rack bars being operatively connected to one of the piston rods, an intermediate shaft between said rack bars, a gear wheel engaging said shaft, and means oscillating said shaft.

2. In a pump, a barrel, a pair of pistons operating therein, a tubular piston rod connected to one of said pistons, a solid piston rod passing through the tubular piston rod and connected to the other piston, a packing gland at the upper end of the tubular pist-on rod, a supporting structure including oppositely disposed, vertical guides, oppositely disposed, vertically reciprocating rack bars mounted in said guides and T- shaped in cross section, each of said rack bars being operatively connected to one of the piston rods, an intermediate shaft between said rack bars, a gear wheel engaging said shaft, a crank arm mounted on the shaft, a connecting rod pivoted to the crank arm, and a power driven wheel with which 5 connected to the respective pistons and eX- tending upward out of the bar-rel, one rod extending beyond the other, a superstructure including oppositely disposed members,`

between which said piston rods operate, end

l0 plates detachably engaged with and connecting said members and bridging the space between the same and recessed upon their inner faces, rack bars guided in said recesses, each rack bar being operatively connected atl its lower end to the respective piston rod, a shaft mounted in said upwardly entending members, a gear wheel mounted on the shaft, a crank arm extending from the shaft, and power operated means for oscillating the shaft.

In testimony whereof I hereunto afiix my signature.

RUSSELL C. LEGO. 

